Message-Id: <199812240104.BAA14906@remus>
From: "Arthur" <arfa AT clara DOT net>
To: <djgpp AT delorie DOT com>
Subject: RE: Could anyone explain ?
Date: Thu, 24 Dec 1998 01:03:21 -0000
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Reply-To: djgpp AT delorie DOT com

> I'm trying to draw 3d-shapes with Allegro, but I haven't had any progress
> yet.
> The examples no. 22 and 26 are pretty complex and I don't understand them.
> Please could anyone give me lines, that would draw a triangle with the
> triangle3d
> function ?
>
> I tried things like this:
> int main()
> {
> BITMAP *bmp;
> V3D vtx1={10,10,250,0,0,0xD0};
> V3D vtx2={100,10,250,0,0,0xD0};
> V3D vtx3={10,100,250,0,0,0xD0};
> allegro_init();
> set_gfx_mode(GFX_AUTODETECT,800,600,800,600);
> set_projection_viewport(0, 0, SCREEN_W, SCREEN_H);
> triangle3d(screen,POLYTYPE_FLAT,NULL,&vtx1,&vtx2,&vtx3);
> getch();
> getch();
> return 1;
> }
>
> but I couldn't notice any output on the screen.
> What should I do ?

The first five elements of the V3D structure should be of type fixed. You
can ignore the fourth and fifth elements, since you're not using them.

Try this:

int main()
{
/*    BITMAP *bmp;  You don't use this BITMAP */
    V3D vtx1={itofix(10),itofix(10),itofix(250),0,0,0xD0};
    V3D vtx2={itofix(100),itofix(10),itofix(250),0,0,0xD0};
    V3D vtx3={itofix(10),itofix(100),itofix(250),0,0,0xD0};
    allegro_init();
    set_gfx_mode(GFX_AUTODETECT,800,600,0,0);
    set_projection_viewport(0, 0, SCREEN_W, SCREEN_H);
    triangle3d(screen,POLYTYPE_FLAT,NULL,&vtx1,&vtx2,&vtx3);
    getch();
    getch(); /* You did want two of these, right? */
    return 0; /* return 1 returns an error code */
}

James Arthur - jaa AT arfa DOT clara DOT net
http://www.jado.org/users/arfa/
ICQ#15054819